FLOODS IN SEPTEMBER 2024 - PART III: EXTREME PRECIPITATION EVENT IN SLOVAKIA IN SEPTEMBER 2024

In September 2024, much of Central Europe experienced above-average precipitation. In mid-September, Storm Boris brought heavy rainfall, flooding, and significant damage to Central and Eastern Europe. This study analyzes the intensity, spatial distribution, and meteorological drivers of the event using observational data from more than 600 precipitation stations across Slovakia. The event is placed in a historical context by comparing its maximum, multi-day, and cumulative precipitation totals recorded between September 11 and September 16, 2024, with previous extreme precipitation occurrences. Additionally, return period estimates and standard deviations [] were employed to assess the rarity of the event. The results indicate that the highest-ever recorded 2-day (267.3 mm in Borinka) and 5-day (379.8 mm in Pernek) precipitation totals in Slovakia occurred during this event. More than 20% of stations with available data recorded new maximum 2-day or 5-day precipitation totals, with multi-day totals surpassing the 100-year and 200-year quantiles. The extremity of the precipitation was most pronounced in 5-day totals, with some stations reporting values at or above the 6-sigma level. V septembri 2024 zaznamenala vek as strednej Eurpy vrazne nadnormlne zrky. Tlakov n Boris, ktor v polovici septembra zasiahla as strednej a vchodnej Eurpy, so sebou priniesla extrmne hrny atmosfrickch zrok a nsledn zplavy a povodne, ktor v tchto oblastiach spsobili rozsiahle kody. Tto tdia skma intenzitu a priestorov rozloenie extrmnych dennch a viacdennch hrnov atmosfrickch zrok pri tejto extrmnej zrkovej situcii na zem Slovenska na zklade dajov z viac ako 600 zrkomernch stanc. Udalos je zasaden do historickho kontextu porovnanm maximlnych dennch, viacdennch a kumulatvnych hrnov zrok zaznamenanch v obdob od 11. do 16. septembra 2024 s predchdzajcimi extrmnymi hodnotami. Na posdenie vnimonosti udalosti boli pouit kvantily a tandardn odchlka (). Vsledky ukazuj, e poas tohto obdobia boli na Slovensku zaznamenan historicky najvyie 2-denn (267,3 mm v Borinke) a 5-denn (379,8 mm v Perneku) hrny zrok. Viac ako 20 % stanc s dostupnmi dajmi zaznamenalo nov maxim 2-alebo 5-dennch hrnov, priom mnoh viacdenn hrny prekroili 100-ron a 200-ron kvantily. Miera extrmnosti bola najvraznejia pri 5-dennch hrnoch, priom viacer stanice vykzali hodnoty presahujce hranicu 6.